package main

import (
	"fmt"
)

const (
	a1 = 1 << iota
	a2
	a3
	a4
)

func main() {
	fmt.Printf("%08b\n", a1)
	fmt.Printf("%08b\n", a2)
	fmt.Printf("%08b\n", a3)
	fmt.Printf("%08b\n", a4)
}
